Abstract
A study of the crystal structure and the magnetic properties, especially the magnetocrystalline anisotropy of (Sm 1− x Y x ) 2Fe 17N y compounds ( x=0, 0.2, 0.4, 0.6, 0.8, and 1.0, 2< y<3) has been performed. All the interstitially nitrided compounds preserve the same Th 2Zn 17- or Th 2Ni 17-type structure as the original compounds. The Curie temperatures decrease from 750 to 700 K as x increases from 0 to 1. The anisotropy field decreases linearly with increasing yttrium content. The spin reorientation has been investigated by means of high field magnetization measurements, AC-susceptibility measurements and thermomagnetic analysis, combined with X-ray diffraction. The anisotropy constants K 1, K 2 and K 3 were derived by a phenomenological analysis, using magnetization curves measured in high fields, applied perpendicular to the alignment direction of the powder samples. A tentative spin phase diagram of the series is presented.
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